.s. senator chuck hagel. in four hours, president obama is expected to name hagel as his choice for defense secretary. that nomination could be bruising. hagel is known for being fiercely independent and the loudest outcry could come from hagel's own fellow republicans. they say he's the wrong choice to oversee the military. the combat veteran, who was badly wounded in vietnam, is openly wary of armed conflict. >> the pain, and we didn't have any medics there with us, and we did have some guys, again, that i think were in pretty bad shape. the morphine and everything was used for them. >> you know, if i ever get out of all this, i am going to do everything i can to assure that war is a last resort. that we, a nation, a people, calls upon to settle a dispute. the horror of it, the pain of it, the suffering of it. >> hagel won two purple hearts for his service in vietnam. he also saved the life of his brother, who was fighting alongside him. hagel has also long called for cuts in defense spending. national correspondent jim acosta is on capitol hill to set the stage. jim, some republicans say